Quarterly report pursuant to Section 13 or 15(d)

Segment Information, Significant Customers and Geographic Information - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area (Detail)

v3.8.0.1
Segment Information, Significant Customers and Geographic Information - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Segment Reporting Information [Line Items]    
Total revenues $ 14,935 $ 16,667
North America [Member]    
Segment Reporting Information [Line Items]    
Total revenues $ 7,114 $ 8,326
North America [Member] | Customer Concentration Risk [Member] | Total Revenues [Member]    
Segment Reporting Information [Line Items]    
% of total revenues 48.00% 50.00%
Europe and Middle East [Member]    
Segment Reporting Information [Line Items]    
Total revenues $ 6,023 $ 7,165
Europe and Middle East [Member] | Customer Concentration Risk [Member] | Total Revenues [Member]    
Segment Reporting Information [Line Items]    
% of total revenues 40.00% 43.00%
Latin America [Member]    
Segment Reporting Information [Line Items]    
Total revenues $ 1,496 $ 721
Latin America [Member] | Customer Concentration Risk [Member] | Total Revenues [Member]    
Segment Reporting Information [Line Items]    
% of total revenues 10.00% 4.00%
Asia Pacific [Member]    
Segment Reporting Information [Line Items]    
Total revenues $ 302 $ 455
Asia Pacific [Member] | Customer Concentration Risk [Member] | Total Revenues [Member]    
Segment Reporting Information [Line Items]    
% of total revenues 2.00% 3.00%